docs: fix preview.cors description (#19271)

Author: sapphi-red

docs/config/preview-options.md

@@ -87,7 +87,9 @@ Uses [`http-proxy`](https://github.com/http-party/node-http-proxy). Full options
 - **Type:** `boolean | CorsOptions`
 - **Default:** [`server.cors`](./server-options#server-cors)
 
-Configure CORS for the preview server. This is enabled by default and allows any origin. Pass an [options object](https://github.com/expressjs/cors#configuration-options) to fine tune the behavior or `false` to disable.
+Configure CORS for the preview server.
+
+See [`server.cors`](./server-options#server-cors) for more details.
 
 ## preview.headers